# Relationship history for MSHA mine 4103856

Current hierarchy: **Martin Marietta Materials Inc → Meridian Aggregates Company Lp → WILL POINT PLANT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Meridian Aggregates Company LP → WILL POINT PLANT; 1994-12-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Norton Crushing Inc → WILL POINT PLANT; 1995-05-01 to 1999-03-04; source msha-controller-operator-history
- **controller_controls_mine:** T E  Norton Jr → WILL POINT PLANT; 1995-05-01 to 1999-03-04; source msha-controller-operator-history
- **controller_controls_operator:** T E  Norton Jr → Norton Crushing Inc; 1995-05-01 to 1999-03-04; source msha-controller-operator-history
- **operator_operates_mine:** Meridian → WILL POINT PLANT; 1999-03-05 to 2001-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Meridian Aggregates Company LP → Meridian; 1999-03-05 to 2001-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company Lp → WILL POINT PLANT; 2001-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → WILL POINT PLANT; 2001-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Meridian Aggregates Company Lp; 2001-04-03 to current/open; source msha-controller-operator-history